Essential Oil Felt Ball Car Diffuser Air Freshner Keychain Charm Boho Decor Handmade This Essential Oil Diffuser Car Refresher is a convenient way to enjoy your favorite scent while on-the-go. Simply add a couple drops of your preferred essential oil to the felt balls and attach the diffuser to your car vent, rear view mirror or keychain. You can enjoy the refreshing scent throughout the day. Can also be used at home in a closet, bathroom, or any small area you'd like to keep smelling great! *essential oil is not included*